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<span class="label label-info">decorators.py</span>
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<a class="github" href="https://github.com/encode/django-rest-framework/tree/master/rest_framework/views.py">
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<h1 id="class-based-views"><a class="toclink" href="#class-based-views">Class-based Views</a></h1>
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<blockquote>
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<p>Django's class-based views are a welcome departure from the old-style views.</p>
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<p>— <a href="https://reinout.vanrees.org/weblog/2011/08/24/class-based-views-usage.html">Reinout van Rees</a></p>
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</blockquote>
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<p>REST framework provides an <code>APIView</code> class, which subclasses Django's <code>View</code> class.</p>
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<p><code>APIView</code> classes are different from regular <code>View</code> classes in the following ways:</p>
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<ul>
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<li>Requests passed to the handler methods will be REST framework's <code>Request</code> instances, not Django's <code>HttpRequest</code> instances.</li>
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<li>Handler methods may return REST framework's <code>Response</code>, instead of Django's <code>HttpResponse</code>. The view will manage content negotiation and setting the correct renderer on the response.</li>
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<li>Any <code>APIException</code> exceptions will be caught and mediated into appropriate responses.</li>
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<li>Incoming requests will be authenticated and appropriate permission and/or throttle checks will be run before dispatching the request to the handler method.</li>
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</ul>
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<p>Using the <code>APIView</code> class is pretty much the same as using a regular <code>View</code> class, as usual, the incoming request is dispatched to an appropriate handler method such as <code>.get()</code> or <code>.post()</code>. Additionally, a number of attributes may be set on the class that control various aspects of the API policy.</p>
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<p>For example:</p>
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<pre><code>from rest_framework.views import APIView
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from rest_framework.response import Response
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from rest_framework import authentication, permissions
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from django.contrib.auth.models import User
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class ListUsers(APIView):
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"""
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View to list all users in the system.
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* Requires token authentication.
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* Only admin users are able to access this view.
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"""
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authentication_classes = (authentication.TokenAuthentication,)
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permission_classes = (permissions.IsAdminUser,)
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def get(self, request, format=None):
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"""
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Return a list of all users.
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"""
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usernames = [user.username for user in User.objects.all()]
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return Response(usernames)
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</code></pre>
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<hr />
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<p><strong>Note</strong>: The full methods, attributes on, and relations between Django REST Framework's <code>APIView</code>, <code>GenericAPIView</code>, various <code>Mixins</code>, and <code>Viewsets</code> can be initially complex. In addition to the documentation here, the <a href="http://www.cdrf.co">Classy Django REST Framework</a> resource provides a browsable reference, with full methods and attributes, for each of Django REST Framework's class-based views.</p>
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<hr />
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<h2 id="api-policy-attributes"><a class="toclink" href="#api-policy-attributes">API policy attributes</a></h2>
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<p>The following attributes control the pluggable aspects of API views.</p>
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<h3 id="renderer_classes"><a class="toclink" href="#renderer_classes">.renderer_classes</a></h3>
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<h3 id="parser_classes"><a class="toclink" href="#parser_classes">.parser_classes</a></h3>
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<h3 id="authentication_classes"><a class="toclink" href="#authentication_classes">.authentication_classes</a></h3>
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<h3 id="throttle_classes"><a class="toclink" href="#throttle_classes">.throttle_classes</a></h3>
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<h3 id="permission_classes"><a class="toclink" href="#permission_classes">.permission_classes</a></h3>
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<h3 id="content_negotiation_class"><a class="toclink" href="#content_negotiation_class">.content_negotiation_class</a></h3>
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<h2 id="api-policy-instantiation-methods"><a class="toclink" href="#api-policy-instantiation-methods">API policy instantiation methods</a></h2>
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<p>The following methods are used by REST framework to instantiate the various pluggable API policies. You won't typically need to override these methods.</p>
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<h3 id="get_renderersself"><a class="toclink" href="#get_renderersself">.get_renderers(self)</a></h3>
|
|
<h3 id="get_parsersself"><a class="toclink" href="#get_parsersself">.get_parsers(self)</a></h3>
|
|
<h3 id="get_authenticatorsself"><a class="toclink" href="#get_authenticatorsself">.get_authenticators(self)</a></h3>
|
|
<h3 id="get_throttlesself"><a class="toclink" href="#get_throttlesself">.get_throttles(self)</a></h3>
|
|
<h3 id="get_permissionsself"><a class="toclink" href="#get_permissionsself">.get_permissions(self)</a></h3>
|
|
<h3 id="get_content_negotiatorself"><a class="toclink" href="#get_content_negotiatorself">.get_content_negotiator(self)</a></h3>
|
|
<h3 id="get_exception_handlerself"><a class="toclink" href="#get_exception_handlerself">.get_exception_handler(self)</a></h3>
|
|
<h2 id="api-policy-implementation-methods"><a class="toclink" href="#api-policy-implementation-methods">API policy implementation methods</a></h2>
|
|
<p>The following methods are called before dispatching to the handler method.</p>
|
|
<h3 id="check_permissionsself-request"><a class="toclink" href="#check_permissionsself-request">.check_permissions(self, request)</a></h3>
|
|
<h3 id="check_throttlesself-request"><a class="toclink" href="#check_throttlesself-request">.check_throttles(self, request)</a></h3>
|
|
<h3 id="perform_content_negotiationself-request-forcefalse"><a class="toclink" href="#perform_content_negotiationself-request-forcefalse">.perform_content_negotiation(self, request, force=False)</a></h3>
|
|
<h2 id="dispatch-methods"><a class="toclink" href="#dispatch-methods">Dispatch methods</a></h2>
|
|
<p>The following methods are called directly by the view's <code>.dispatch()</code> method.
|
|
These perform any actions that need to occur before or after calling the handler methods such as <code>.get()</code>, <code>.post()</code>, <code>put()</code>, <code>patch()</code> and <code>.delete()</code>.</p>
|
|
<h3 id="initialself-request-42args-kwargs"><a class="toclink" href="#initialself-request-42args-kwargs">.initial(self, request, *args, **kwargs)</a></h3>
|
|
<p>Performs any actions that need to occur before the handler method gets called.
|
|
This method is used to enforce permissions and throttling, and perform content negotiation.</p>
|
|
<p>You won't typically need to override this method.</p>
|
|
<h3 id="handle_exceptionself-exc"><a class="toclink" href="#handle_exceptionself-exc">.handle_exception(self, exc)</a></h3>
|
|
<p>Any exception thrown by the handler method will be passed to this method, which either returns a <code>Response</code> instance, or re-raises the exception.</p>
|
|
<p>The default implementation handles any subclass of <code>rest_framework.exceptions.APIException</code>, as well as Django's <code>Http404</code> and <code>PermissionDenied</code> exceptions, and returns an appropriate error response.</p>
|
|
<p>If you need to customize the error responses your API returns you should subclass this method.</p>
|
|
<h3 id="initialize_requestself-request-42args-kwargs"><a class="toclink" href="#initialize_requestself-request-42args-kwargs">.initialize_request(self, request, *args, **kwargs)</a></h3>
|
|
<p>Ensures that the request object that is passed to the handler method is an instance of <code>Request</code>, rather than the usual Django <code>HttpRequest</code>.</p>
|
|
<p>You won't typically need to override this method.</p>
|
|
<h3 id="finalize_responseself-request-response-42args-kwargs"><a class="toclink" href="#finalize_responseself-request-response-42args-kwargs">.finalize_response(self, request, response, *args, **kwargs)</a></h3>
|
|
<p>Ensures that any <code>Response</code> object returned from the handler method will be rendered into the correct content type, as determined by the content negotiation.</p>
|
|
<p>You won't typically need to override this method.</p>
|
|
<hr />
|
|
<h1 id="function-based-views"><a class="toclink" href="#function-based-views">Function Based Views</a></h1>
|
|
<blockquote>
|
|
<p>Saying [that class-based views] is always the superior solution is a mistake.</p>
|
|
<p>— <a href="http://www.boredomandlaziness.org/2012/05/djangos-cbvs-are-not-mistake-but.html">Nick Coghlan</a></p>
|
|
</blockquote>
|
|
<p>REST framework also allows you to work with regular function based views. It provides a set of simple decorators that wrap your function based views to ensure they receive an instance of <code>Request</code> (rather than the usual Django <code>HttpRequest</code>) and allows them to return a <code>Response</code> (instead of a Django <code>HttpResponse</code>), and allow you to configure how the request is processed.</p>
|
|
<h2 id="api_view"><a class="toclink" href="#api_view">@api_view()</a></h2>
|
|
<p><strong>Signature:</strong> <code>@api_view(http_method_names=['GET'])</code></p>
|
|
<p>The core of this functionality is the <code>api_view</code> decorator, which takes a list of HTTP methods that your view should respond to. For example, this is how you would write a very simple view that just manually returns some data:</p>
|
|
<pre><code>from rest_framework.decorators import api_view
|
|
|
|
@api_view()
|
|
def hello_world(request):
|
|
return Response({"message": "Hello, world!"})
|
|
</code></pre>
|
|
<p>This view will use the default renderers, parsers, authentication classes etc specified in the <a href="../settings/">settings</a>.</p>
|
|
<p>By default only <code>GET</code> methods will be accepted. Other methods will respond with "405 Method Not Allowed". To alter this behaviour, specify which methods the view allows, like so:</p>
|
|
<pre><code>@api_view(['GET', 'POST'])
|
|
def hello_world(request):
|
|
if request.method == 'POST':
|
|
return Response({"message": "Got some data!", "data": request.data})
|
|
return Response({"message": "Hello, world!"})
|
|
</code></pre>
|
|
<h2 id="api-policy-decorators"><a class="toclink" href="#api-policy-decorators">API policy decorators</a></h2>
|
|
<p>To override the default settings, REST framework provides a set of additional decorators which can be added to your views. These must come <em>after</em> (below) the <code>@api_view</code> decorator. For example, to create a view that uses a <a href="../throttling/">throttle</a> to ensure it can only be called once per day by a particular user, use the <code>@throttle_classes</code> decorator, passing a list of throttle classes:</p>
|
|
<pre><code>from rest_framework.decorators import api_view, throttle_classes
|
|
from rest_framework.throttling import UserRateThrottle
|
|
|
|
class OncePerDayUserThrottle(UserRateThrottle):
|
|
rate = '1/day'
|
|
|
|
@api_view(['GET'])
|
|
@throttle_classes([OncePerDayUserThrottle])
|
|
def view(request):
|
|
return Response({"message": "Hello for today! See you tomorrow!"})
|
|
</code></pre>
|
|
<p>These decorators correspond to the attributes set on <code>APIView</code> subclasses, described above.</p>
|
|
<p>The available decorators are:</p>
|
|
<ul>
|
|
<li><code>@renderer_classes(...)</code></li>
|
|
<li><code>@parser_classes(...)</code></li>
|
|
<li><code>@authentication_classes(...)</code></li>
|
|
<li><code>@throttle_classes(...)</code></li>
|
|
<li><code>@permission_classes(...)</code></li>
|
|
</ul>
|
|
<p>Each of these decorators takes a single argument which must be a list or tuple of classes.</p>
|
|
<h2 id="view-schema-decorator"><a class="toclink" href="#view-schema-decorator">View schema decorator</a></h2>
|
|
<p>To override the default schema generation for function based views you may use
|
|
the <code>@schema</code> decorator. This must come <em>after</em> (below) the <code>@api_view</code>
|
|
decorator. For example:</p>
|
|
<pre><code>from rest_framework.decorators import api_view, schema
|
|
from rest_framework.schemas import AutoSchema
|
|
|
|
class CustomAutoSchema(AutoSchema):
|
|
def get_link(self, path, method, base_url):
|
|
# override view introspection here...
|
|
|
|
@api_view(['GET'])
|
|
@schema(CustomAutoSchema())
|
|
def view(request):
|
|
return Response({"message": "Hello for today! See you tomorrow!"})
|
|
</code></pre>
|
|
<p>This decorator takes a single <code>AutoSchema</code> instance, an <code>AutoSchema</code> subclass
|
|
instance or <code>ManualSchema</code> instance as described in the <a href="../schemas/">Schemas documentation</a>.
|
|
You may pass <code>None</code> in order to exclude the view from schema generation.</p>
|
|
<pre><code>@api_view(['GET'])
|
|
@schema(None)
|
|
def view(request):
|
|
return Response({"message": "Will not appear in schema!"})
|
|
</code></pre>
|
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